[argoniummm]

package 
{
	import flash.events.MouseEvent;
	import flash.display.MovieClip;
	import flash.display.DisplayObject;
 
	public class App extends MovieClip
	{
		var using2:Boolean = false;
		var using3:Boolean = false;
 
		var b1:int;
		var b2:int;
		var b3:int;
 
		var v:int = 0;
		var les:int = 0;
		var sbor:int = 0;
 
		var v1:int = 0;
		var v2:int = 0;
		var v3:int = 0;
 
		var les1:int = 0;
		var les2:int = 0;
		var les3:int = 0;
 
		var d1:int = 0;
		var d2:int = 0;
		var d3:int = 0;
 
		public function App()
		{
			act2.addEventListener(MouseEvent.CLICK,activating2etaj);
			act3.addEventListener(MouseEvent.CLICK,activating3etaj);
			add_itog.addEventListener(MouseEvent.CLICK,resultat);
		}
 
		public function activating2etaj(e:MouseEvent):void
		{
			act2.enabled = false;
			act3.mouseEnabled = true;
			act3.enabled = true;
			using2 = true;
			diametr_2.enabled = true;
			dl2etaja.enabled = true;
			sh2etaja.enabled = true;
			dlperegorodok2.enabled = true;
			visotaetaja2.enabled = true;
		}
 
		public function activating3etaj(e:MouseEvent):void
		{
			act3.enabled = false;
			using3 = true;
			diametr_3.enabled = true;
			dl3etaja.enabled = true;
			sh3etaja.enabled = true;
			dlperegorodok3.enabled = true;
			visotaetaja3.enabled = true;
		}
 
		public function resultat(e:MouseEvent):void
		{
			if (diametr_1.selectedItem.label == "20-22")
			{
				d1 = 21;
			}
			if (diametr_1.selectedItem.label == "22-24")
			{
				d1 = 23;
			}
			if (diametr_1.selectedItem.label == "24-28")
			{
				d1 = 26;
			}
			if (diametr_1.selectedItem.label == "28-32")
			{
				d1 = 30;
			}
			if (diametr_1.selectedItem.label == "32-36")
			{
				d1 = 34;
			}
			if (diametr_1.selectedItem.label == "36-44")
			{
				d1 = 40;
			}
 
			if (using2 = true)
			{
				if (diametr_2.selectedItem.label == "20-22")
				{
					d2 = 21;
				}
				if (diametr_2.selectedItem.label == "22-24")
				{
					d2 = 23;
				}
				if (diametr_2.selectedItem.label == "24-28")
				{
					d2 = 26;
				}
				if (diametr_2.selectedItem.label == "28-32")
				{
					d2 = 30;
				}
				if (diametr_2.selectedItem.label == "32-36")
				{
					d2 = 34;
				}
				if (diametr_2.selectedItem.label == "36-44")
				{
					d2 = 40;
				}
			}
 
			if (using3 = true)
			{
				if (diametr_3.selectedItem.label == "20-22")
				{
					d3 = 21;
				}
				if (diametr_3.selectedItem.label == "22-24")
				{
					d3 = 23;
				}
				if (diametr_3.selectedItem.label == "24-28")
				{
					d3 = 26;
				}
				if (diametr_3.selectedItem.label == "28-32")
				{
					d3 = 30;
				}
				if (diametr_3.selectedItem.label == "32-36")
				{
					d3 = 34;
				}
				if (diametr_3.selectedItem.label == "36-44")
				{
					d3 = 40;
				}
			}
 
			v1 = 2 * int(visotaetaja1) *(int(dl1etaja.text) + int(sh1etaja.text)) + int(visotaetaja1.text) * int(dlperegorodok1.text) * (d1 / 100);
			if (using2 = true)
			{
				v2 = 2 * int(visotaetaja2) *(int(dl2etaja.text) + int(sh2etaja.text)) + int(visotaetaja2.text) * int(dlperegorodok2.text) * (d2 / 100);
			}
			if (using2 = true)
			{
				v3 = 2 * int(visotaetaja3) *(int(dl3etaja.text) + int(sh3etaja.text)) + int(visotaetaja3.text) * int(dlperegorodok3.text) * (d3 / 100);
			}
 
			v = v1 + v2 + v3;
 
			les1=int(diametr_1.selectedItem.data) * v1;
			les2=int(diametr_2.selectedItem.data) * v2;
			les3=int(diametr_3.selectedItem.data) * v3;
 
			les = les1 + les2+ les3;
 
			sbor = les /2;
 
			cost_lesa.text = String(les);;
			v_all.text = String(v);;
			cost_sborki.text = String(sbor);;
		}
	}
 
}

Вот текст ошибки: TypeError: Error #1009: Не удается вызвать свойство или метод со ссылкой на объект "null".
at App/resultat()
При нажатии на кнопку выполняется функция resultat. По тексту ошибки флеш считает, что она нулевая. Кто может помочь найти ошибку?